McDonald’s Japan is advertising its new Three-Cheese Beef Stew Pie with a parody of the song "Cirno’s Perfect Math Class" by IOSYS from Touhou Project. You can watch the McDonald’s video via its official X (formerly Twitter) account and YouTube.

Like previous parody songs, the lyrics have been changed to reflect the menu item in question. Cirno advertises the three types of cheese that are in the pie (cheddar, gouda, and Camembert). Instead of yelling “baka, baka” (“idiot, idiot”) during the chorus, the lyrics go “burger, burger,” which sounds very similar in Japanese. Other Touhou Project characters who make appearances in the video include Yakumo and Marisa.

You can watch the video below via the McDonald’s Japan YouTube channel:

The original Cirno’s Perfect Math Class music video, which IOSYS uploaded 15 years ago, has accumulated 13 million views on YouTube. It is an arrangement of her boss theme from Embodiment of Scarlet Devil. You can watch that below to compare the two.

This is not the first time that McDonald’s has used an arrangement of a Touhou Project track for an advertising campaign. In 2024, it released a version of "Marisa Stole The Precious Thing" to promote its Samurai Mac Triple Thick Beef Burger.

The Three-Cheese Beef Stew Pie is available at McDonald’s Japan for a limited time. The pie itself (without a combo or anything) costs 240 JPY ($1.55).

The post Touhou Cirno’s Perfect Math Class Used to Promote McDonald’s appeared first on Siliconera.

More Desktop Mate DLC is here and coming, with the immediately available items being two versions of Reimu from the Touhou Project series and the upcoming ones being two VOCALOMAKETS Vocaloids. The $14.99 Hakurei Reimu and $7.49 Yukkuri Reimu add-ons are live now, and Kizuna Akari and Yuzuki Yukari will launch on December 9, 2025. 

In the case of the Touhou Project Desktop Mate additions, both DLC feature versions of the same character. They can be purchased alone or in a $20.23 bundle together. Yukkuri Reimu is less expensive due to, well, her being just a head. That includes Nonoko’s design and a new 3D model. The Hakurei Reimu option is more detailed, both due to the fact that she includes new voiced lines by Sumire Uesaka and actions that involve her shrine maiden duties. It also features a custom wallpaper inspired by the series from Nonoko. 

Here’s the trailer showing them off:

And you can see the official screenshots of both below.

As for the Vocaloids Kizuna Akari and Yuzuki Yukari, we know some details about that. Those will feature VOCALOMAKETS audio for their voiced lines. Characters will have special actions. Juu Ayakura will also work on their models. 

Here’s how those will look:

Desktop Mate is available on PCs and the Touhou Project Hakurei Reimu and Yukkuri Reimu DLC are out now.

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